1. Bing was gaslighting me into 9.11 being greater than 9.9
2. ChatGPT said that 7x7/7+7/7+7/7 was 24.
3. When expanding (x+1)^2 the output was 2x^2+2.
Regardless of any level of interpretation and irrelevant information if it can't deterministically understand correctness and the semantics of the operations in question then it's fucking useless.
What is worse in an educational context is that it is actively harmful.